1、Designation: B496 04 (Reapproved 2010)1B496 13Standard Specification forCompact Round Concentric-Lay-Stranded CopperConductors1This standard is issued under the fixed designation B496; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1 NOTEReferences to Sections 15 and 14 in 3.1.3 and 3.1.5, respectively, were corrected editorially in 2010.1. Scope
3、1.1 This specification covers bare compact round concentric-lay-stranded conductors made from uncoated round copper wiresfor general use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layersof helically laid compacted wires (Explanatory N
4、ote 1 and Note 2).1.2 The values stated in inch-pound or SI units are to be regarded separately as standard.The values in each system are not exactequivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may resultin nonconformance with the
5、specification.1.2.1 For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.2. Referenced Documents2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extentreferenced herein:2.2 ASTM
6、 Standards:2B3 Specification for Soft or Annealed Copper WireB263 Test Method for Determination of Cross-Sectional Area of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electrical Conductors3. Ordering Information3.1 Orders for material under this specification shall include t
7、he following information:3.1.1 Quantity of each size (Table 1),3.1.2 Conductor size; circular-mil area or AWG, (Section 6 and Table 1),3.1.3 Packaging (Section 15), if required,3.1.4 Special package marking, and3.1.5 Place of inspection (Section 14).4. Joints4.1 Welds and brazes may be made in rods
8、or in wires prior to final drawing.4.2 Welds and brazes may be made in the individual round drawn wires for compact conductors, but shall not be closer togetherthan 1 ft (300 mm) for conductor of 19 wires or less or closer than 1 ft (300 mm) in a layer for conductor of more than 19 wires.4.3 No join
9、t nor splice shall be made in a compact-stranded conductor as a whole.5. Lay5.1 The lay length of lay every layer shall be not less than 8 times nor more than 16 times the outside diameter of the completedconductor. conductor except that, for sizes 2AWG (33.6 mm2) and smaller, the maximum lay length
10、 shall be 17.5 times the outsidediameter.1 This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on Conductorsof Copper and Copper Alloys.Current edition approved Oct. 1, 2010April 1, 2013. Published Decemb
11、er 2010April 2013. Originally approved in 1969. Last previous edition approved in 20042010 asB496 04.B496 101. DOI: 10.1520/B0496-04R10E01.10.1520/B0496-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM
12、 Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically pos
13、sible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, W
14、est Conshohocken, PA 19428-2959. United States15.2 The direction of lay of the outer layer shall be left-hand, and it shall be reversed in successive layers, unidirectional, orunilay.6. Construction6.1 The construction of the compact round concentric-lay-stranded conductors shall be as shown in Tabl
15、e 1.6.2 The starting round copper wires used in the fabrication of the compact round conductor shall be of such diameter as toproduce a finished conductor having a nominal cross-sectional area and diameter as prescribed in Table 1.7. Density7.1 For the purpose of calculating linear densities, cross
16、sections, and so forth, the density of the copper shall be taken as 8.89g/cm3 (0.32117 lb/in.3) at 20C.TABLE 1 Construction Requirements of Compact Round Concentric-Lay-Stranded Copper ConductorsConductor Size Number ofWiresCompact Conductor Diameter Mass,lb/1000 ftMass,kg/kmDC Resistance at 20Ccmil
17、 AWG mm2 in. mm /1000 ft /km1 000 000 . 507 61A 1.060 26.9 3086 4590 0.0106 0.0347900 000 . 456 61A 0.999 25.4 2780 4140 0.0118 0.0386800 000 . 405 61A 0.938 23.8 2469 3680 0.0132 0.0433750 000 . 380 61A 0.908 23.0 2316 3450 0.0141 0.0462700 000 . 355 61A 0.877 22.3 2160 3220 0.0151 0.0495650 000 .
18、329 61A 0.845 21.4 2006 2990 0.0163 0.0535600 000 . 304 61A 0.813 20.6 1850 2760 0.0176 0.0577550 000 . 279 61A 0.775 19.7 1700 2530 0.0192 0.0630500 000 . 253 37B 0.736 18.7 1542 2300 0.0212 0.0695450 000 . 228 37B 0.700 17.8 1390 2070 0.0235 0.0770400 000 . 203 37B 0.659 16.7 1236 1840 0.0264 0.08
19、65350 000 . 177 37B 0.616 15.7 1080 1610 0.0302 0.0990300 000 . 152 37B 0.570 14.5 925 1380 0.0353 0.116250 000 . 127 37B 0.520 13.2 772 1150 0.0423 0.139211 600 4/0 107 19C 0.475 12.1 653 972 0.0500 0.164167 800 3/0 85.0 19C 0.423 10.8 518 771 0.0630 0.206133 100 2/0 67.4 19C 0.376 9.57 411 611 0.0
20、795 0.261105 600 1/0 53.5 19C 0.336 8.55 326 485 0.100 0.32883 690 1 42.4 19C 0.299 7.60 259 385 0.126 0.41366 360 2 33.6 7 0.268 6.81 205 305 0.159 0.52141 740 4 21.2 7 0.213 5.41 129 192 0.253 0.83026 240 6 13.3 7 0.169 4.29 80.9 121 0.403 1.3216 510 8 8.37 7 0.134 3.40 51.0 75.9 0.641 2.10TABLE 1
21、 Construction Requirements of Compact Round Concentric-Lay-Stranded Copper ConductorsConductor Size Number ofWiresCompact Conductor Diameter Mass,lb/1000 ftMass,kg/kmDC Resistance at 20Ccmil AWG mm2 in. mm /1000 ft /km1 000 000 . 507 61A 1.060 26.9 3086 4590 0.0106 0.0347900 000 . 456 61A 0.999 25.4
22、 2780 4140 0.0118 0.0386800 000 . 405 61A 0.938 23.8 2469 3680 0.0132 0.0433750 000 . 380 61A 0.908 23.0 2316 3450 0.0141 0.0462700 000 . 355 61A 0.877 22.3 2160 3220 0.0151 0.0495650 000 . 329 61A 0.845 21.4 2006 2990 0.0163 0.0535600 000 . 304 61A 0.813 20.6 1850 2760 0.0176 0.0577550 000 . 279 61
23、A 0.775 19.7 1700 2530 0.0192 0.0630500 000 . 253 37B 0.736 18.7 1542 2300 0.0212 0.0695450 000 . 228 37B 0.700 17.8 1390 2070 0.0235 0.0770400 000 . 203 37B 0.659 16.7 1236 1840 0.0264 0.0865350 000 . 177 37B 0.616 15.7 1080 1610 0.0302 0.0990300 000 . 152 37B 0.570 14.5 925 1380 0.0353 0.116250 00
24、0 . 127 37B 0.520 13.2 772 1150 0.0423 0.139211 600 4/0 107 19C 0.475 12.1 653 972 0.0500 0.164167 800 3/0 85.0 19C 0.423 10.8 518 771 0.0630 0.206133 100 2/0 67.4 19C 0.376 9.57 411 611 0.0795 0.261105 600 1/0 53.5 19C 0.336 8.55 326 485 0.100 0.32883 690 1 42.4 19C 0.299 7.60 259 385 0.126 0.41366
25、 360 2 33.6 7 0.268 6.81 205 305 0.159 0.52141 740 4 21.2 7 0.213 5.41 129 192 0.253 0.83026 240 6 13.3 7 0.169 4.29 80.9 121 0.403 1.3216 510 8 8.37 7 0.134 3.40 51.0 75.9 0.641 2.10A 58 wires minimum.B 35 wires minimum.C 18 wires minimum.B496 1328. Mass and Resistance8.1 The mass per unit length a
26、nd dc electrical resistance of a compact round conductor are greater than the total of thesecharacteristics of the compressed wires composing the finished conductor, depending upon the lay. The standard increment of massper unit length and electrical resistance shall be taken as 2 %. The nominal mas
27、s per unit length and dc resistance are shown inTable 1. When the dc resistance is measured at other than 20C, it shall be corrected by using the multiplying factors given in Table2.8.2 In cases where the lay is definitely known, the increment may be calculated if desired (Explanatory Note 3).8.3 Fo
28、r conductors to be used in covered or insulated wires or cables, direct current (DC) resistance measurement may be usedinstead of the method outlined in Section 9, to determine compliance with this specification.9. Variation in Area9.1 The cross-sectional area of the compact round conductor shall be
29、 not less than 98 % of the cross-sectional area as specifiedin Column 1 of Table 1.9.2 The manufacturer shall determine the cross-sectional area by Test Method B263. In applying this method, the increment inmass per unit length resulting from stranding may be the applicable value specified in 9.1 or
30、 may be calculated from the measureddimensions of the sample under test. In case of question regarding area compliance, the actual mass per unit length increment dueto stranding shall be calculated.10. Variation in Diameter10.1 The average diameter of the compact-round conductor shall not vary by mo
31、re than +1 % and 2 % from the diameterspecified in Table 1.11. Finish11.1 The conductor surface shall be smooth and free of imperfections not consistent with the best commercial practice.12. Physical and Electrical Tests12.1 Tests for the physical and electrical properties of wires composing the con
32、ductors shall be made before stranding inaccordance with Specification B3 (Explanatory Note 4 and Note 5).13. Requirements for Wires13.1 Before stranding and compacting the copper wire shall meet all of the requirements of Specification B3.13.2 Wire shaped before stranding shall meet the requirement
33、s of Specification B3, except for diameter tolerance. Theelongation requirement shall be the same as round wires of equal nominal area. The area tolerance for shaped wires shall be suchthat the finished conductor conforms to Section 10 of this specification.TABLE 2 Temperature Correction Factors for
34、 ConductorResistanceTemperature, C Multiplying Factor for Conversion to20C0 1.0855 1.06310 1.04115 1.02020 1.00025 0.98130 0.96235 0.94440 0.92745 0.91150 0.89555 0.87960 0.86465 0.85070 0.83675 0.82280 0.80985 0.79790 0.784B496 13314. Inspection14.1 All tests and inspection shall be made at the pla
35、ce of manufacture unless otherwise especially agreed upon between themanufacturer and the purchaser at the time of purchase. The manufacturer shall afford the inspector representing the purchaser allreasonable facilities, without charge, to satisfy him that the material is being furnished in accorda
36、nce with this specification.15. Packaging and Package Marking15.1 Package sizes for conductors shall be agreed upon by the manufacturer and the purchaser in the placing of individualorders.15.2 The conductors shall be protected against damage in ordinary handling and shipping.15.3 The net mass, leng
37、th, size, kind of conductor, purchase order number, and any other marks required by the purchase ordershall be marked on a tag attached to the end of the conductor inside of the package. The same information, together with themanufacturers serial number (if any) and all shipping marks required by th
38、e purchaser, shall appear on the outside of eachpackage.16. Keywords16.1 compact copper conductor; compact round concentric-lay-stranded copper conductor; concentric-lay-stranded copperconductor; copper electrical conductor; electrical conductor; electrical conductorcopper;conductorcopper; stranded
39、copperconductorEXPLANATORY NOTESNOTE 1In this specification only compact round concentric-lay-stranded conductor constructions are specifically designated. Constructions not includedin this specification should be specifically agreed upon between the manufacturer and the purchaser when placing the o
40、rder.NOTE 2For definitions of terms relating to conductors, reference should be made to Terminology B354.NOTE 3The increment of mass or electrical resistance of a completed concentric-lay-stranded conductor, k, in percent, is:k 5100m 21!where m is the stranding factor, and is the ratio of the mass o
41、r electrical resistance of a unit length of stranded conductor to that of a solid conductorof the same cross-sectional area or of a stranded conductor with infinite length of lay, that is, all wires parallel to the conductor axis. The stranding factorm for the completed stranded conductor is the num
42、erical average of the stranding factors for each of the individual wires in the conductor, including thestraight core wire, if any (for which the stranding factor is unity). The stranding factor, mind, for any given wire in a concentric-lay-stranded conductoris:mind5=119.8696/n2!where n = (length of
43、 lay)/diameter of helical path of the wire.The derivation of the above as given in NBS Handbook 1003 is based on round wire constructions which are applicable to compacted wireconstructions.NOTE 4Individual wires are not to be unlaid from compact round conductors for testing purposes. The physical p
44、roperties of the individual compactedwires will be altered by the deformation brought about by compacting, unlaying, and straightening for test.NOTE 5To test stranded conductors for tensile strength successfully as a unit requires adequate means of gripping the ends of the test specimen withoutcausi
45、ng damage that may result in failure below the actual strength of the conductor. Various means are available, such as compression sleeves, splitsleeves, and preformed grips, but ordinary jaws or clamping devices usually are not suitable.ASTM International takes no position respecting the validity of
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